Form 3 Chapter 5 Trigonometric Ratios-Part 3

 $\cos\ 30\degree=\sin\ 60\degree=$  

•  $\frac{1}{2}$  

•  $\frac{1}{\sqrt{2}}$  

•  $\frac{\sqrt{3}}{2}$  

•  $\sqrt{3}$  

 $\sin\ 45\degree=\cos\ 45\degree=$  

•  $\frac{1}{2}$  

•  $\frac{1}{\sqrt{2}}$  

•  $\frac{\sqrt{3}}{2}$  

•  $\sqrt{3}$  

Without using a scientific calculator, find the value of  $4\left(\cos\ 30\degree+\sin60\degree\right)$ . 

•  $\sqrt{3}$  

•  $2\sqrt{3}$  

•  $3\sqrt{3}$  

•  $4\sqrt{3}$  

Convert  $12.85\degree$  to degrees and minutes.

•  $12\degree49'$  

•  $12\degree50'$  

•  $12\degree51'$  

•  $12\degree52'$  

Convert  $35\degree48'$  to degrees.

•  $35.6\degree$  

•  $35.7\degree$  

•  $35.8\degree$  

•  $35.9\degree$  

Find the value of cos 75.4^o by using scientific calculator. Give your answer correct to 4 decimal places.

• 0.2520

• 0.2521

• 0.2522

• 0.2523

Find the value of  $\tan30\degree37'$   by using scientific calculator. Give your answer correct to 4 decimal places.

• 0.5916

• 0.5917

• 0.5918

• 0.5919

Given that sin x = 0.2055. Find the value of x. 

•  $11.8\degree$  

•  $11.9\degree$  

•  $12.0\degree$  

Given that cos x = 0.0315. Find the value of x. 

•  $88\degree10'$  

•  $88\degree11'$  

•  $88\degree12'$  

•  $88\degree13'$  

Given that $\sin x=\frac{2}{5}$ and  $\cos\ x=\frac{\sqrt{7}}{5}$ . Find the value of  $\tan x$ without using calculator.   

•  $\frac{2}{\sqrt{7}}$  

•  $\frac{\sqrt{7}}{2}$  

•  $\frac{2\sqrt{7}}{25}$  

•  $\frac{25}{2\sqrt{7}}$